问题
For example: my app got few messages and I need to inform user about this.
Do I need make widget?
I read this How do I add a number to the launcher icon like HTC mail Does?, but it looks like I can't do this. Only for HTC.
回答1:
Launcher icons as managed by the launcher which the default launcher does not have this functionality.
I would recommend to use the notification bar and then secondary a possible widget but it wouldn't be required.
As a note, a launcher that does have this functionality is ADW but I don't believe there is an API for it so they would manager which notifications get displayed on which applications. ADWNotifier: check here
回答2:
Android's user notification design principle revolves around the notification bar. The user should be always alerted only using notifications.
来源：https://stackoverflow.com/questions/14273225/how-do-i-show-badge-counts-on-the-app-icon-or-in-widget